Evening Garry,
Trust me the basis of weight in the metric system is 1 cubic centimeter of
water = 1 gram.
I trust you and I believe you. Thanks to you and Marshal
for the patience to change my mind. Honestly........
I am a nut for numbers and a nut for specifics.
If we knew how all the old units were defined, we might have problems with
others.
I have always wondered how the acre came about with area that does not
allow a square acre. That must go back to townships and how they were
defined. I know, some will say "You can Have a square Acre".
Possibly I got this way from working with analog and digital devices and
working scale factors to several decimal places.
I had to scale analog devices to pH, EC, Humidity, and others.
It can be hard. So, I wrote a nice program to find the scale factors for
me. No longer did I have to wear out my HP 15C.
I still see that definition as outdated, theoretical and non obtainable
except under laboratory conditions.
Everyone knows how hard it is to find pure water,
Often I add 100, 200, and up to 450 ppm to a water solution.
I add several of these solutions which must add weight.
Seem this would change the weight, as would several ppm of silver,
especially counting the particles.
Then the weight of the solution would be different than the defined
value. Likely the calculated ppm would be wrong, if using the specific
volume standard.
I fully realize this is of no significance to practical applications.
In practice, ( other than laboratory work ) a certain amount of estimation
and compromise exists.
Thanks again for helping me to see the logic here.
Wayne
=======================
http://en.wikipedia.org/wiki/Gram
1 fluid oz of water weighs 1oz avoirdupois
From: CWFugitt [mailto:c_wa...@earthlink.net]
Sent: Thursday, May 24, 2007 12:27 PM
To: silver-list@eskimo.com
Subject: RE: CS>Concentration?....ppm?
At 08:53 AM 5/24/2007, you wrote:
in the case of water 1 cc weighs EXACTLY one gram. A pint is a pound the
whole world round ya know?
Water is THE standard for volume and weight.
I did not find this in the "international System of Units".
Short simple, ....... you actually think all water weighs the same ?
Wayne
10ppm CS has 10mg silver per liter. 1000mg per gram. 100 liters per gram @
10ppm. This is why the metric system is more sensible.
IE it would be easier to drown yourself in CS than to get argyria if your
figures are correct.
From: CWFugitt [<mailto:c_wa...@earthlink.net>mailto:c_wa...@earthlink.net]
Sent: Wednesday, May 23, 2007 11:57 PM
To: silver-list@eskimo.com
Subject: CS>Concentration?....ppm?
At 10:06 PM 5/23/2007, you wrote:
ppm and mg/l are the same.
I doubt that. One is a unit of weight, the other a unit of volume.
This statement sounds like something used in the medical profession.
Where did you learn that? It might be true on some things, but weight and
volume does not make specific amounts or ratios.
No one can say how many mg makes a liter.
Try lead, gold, water, ice, ice cream, whipping cream, and
10, 000 other things. All are different of course.
Typically, in most cases, ppm is a weight, 1 to 1 million,
Most calculations are done this way.
The unit can be anything, ounces, grams, mg, pounds, tons or whatever.
Weight to Volume is doomed to failure and errors.
Wayne
